Process for making roofing membrane of epdm elastomer and...

Details Process for making roofing membrane of epdm elastomer and... Process for making roofing membrane of epdm elastomer and...

B - Operations, Transporting

29

C

B29C 35/18 (2006.01) C08J 3/24 (2006.01) C08K 3/06 (2006.01) C08K 3/30 (2006.01) C08L 23/16 (2006.01) E04B 5/06 (2006.01) E04D 5/06 (2006.01)

Patent

CA 2055013

TITLE PROCESS FOR MAKING ROOFING MEMBRANE OF EPDM ELASTOMER AND ETHYLENE-CONTAINING POLYMER ABSTRACT OF THE DISCLOSURE A process for curing a heat weldable roofing membrane by applying elemental sulfur on the exterior surface of the roofing membrane, said membrane being a blend of (a) 50-80% by weight of an ethylene/propylene/nonconjugated diene elastomer and (b) 20-50% by weight of an ethylene-containing polymer selected from the group consisting of polyethylene, an ethylene alpha-monoolefin copolymer wherein the monoolefin contains from 3-12 carbon atoms and is present in amounts of 2-8% by weight, and an ethylene/vinyl acetate copolymer having a vinyl acetate content up to about 10% by weight, said membrane containing a cure accelerator. The roofing membrane is exposed to ambient outdoor temperatures resulting in migration of sulfur to the interior of the membrane where, together with the cure accelerator, it effects cure of the membrane.

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